Hi @jpinpin
You can try looking for Security events in Event Viewer with ID 5136. As suggested in the article below you can use more robust software to audit GPO changes.
Please see the following for more details:
https://www.manageengine.com/products/active-directory-audit/how-to/how-to-track-group-policy-changes.html#:~:text=Using%20native%20auditing%20tools%20(Event,changes%2C%20and%20GPO%20link%20changes.
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If this is helpful please accept answer.